Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY - Preferred Stock Issued and Outstanding (Details)

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SHAREHOLDERS' EQUITY - Preferred Stock Issued and Outstanding (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
Rate
shares
Dec. 31, 2018
USD ($)
shares
Feb. 27, 2018
$ / shares
Class of Stock [Line Items]      
Preferred Stock, Shares Outstanding | shares 740,500 740,500  
Preferred Stock, Value, Outstanding $ 1,203    
Preferred Stock, Value, Issued $ 1,203 $ 1,203  
Preferred Stock      
Class of Stock [Line Items]      
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 1,000    
Series A Preferred Stock      
Class of Stock [Line Items]      
Preferred stock, dividend percentage 0.085    
Series B Preferred Stock      
Class of Stock [Line Items]      
Preferred Stock, Shares Outstanding | shares 35,500    
Preferred Stock, Value, Outstanding $ 23    
Preferred stock, dividend percentage 3-mo. LIBOR + 270 bps    
Preferred Stock, Redemption Date Jan. 15, 2017    
Depository share, percent interest in preferred stock 0.025    
Series D Preferred Stock      
Class of Stock [Line Items]      
Preferred Stock, Shares Outstanding | shares 400,000    
Preferred Stock, Value, Outstanding $ 386    
Preferred Stock, Dividend Rate, Percentage | Rate 6.25%    
Preferred Stock, Redemption Date Jul. 15, 2021    
Series D Preferred Stock2      
Class of Stock [Line Items]      
Preferred Stock, Shares Outstanding | shares 200,000    
Preferred Stock, Value, Outstanding $ 199    
Preferred Stock, Dividend Rate, Percentage | Rate 6.25%    
Preferred Stock, Redemption Date Jul. 15, 2021    
Series C Preferred Stock      
Class of Stock [Line Items]      
Preferred Stock, Shares Outstanding | shares 100,000    
Preferred Stock, Value, Outstanding $ 100    
Preferred Stock, Dividend Rate, Percentage | Rate 5.875%    
Preferred Stock, Redemption Date Jan. 15, 2022    
Series E Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Shares Outstanding | shares 5,000    
Preferred Stock, Value, Outstanding $ 495    
Preferred Stock, Dividend Rate, Percentage | Rate 5.70%    
Preferred Stock, Redemption Date Apr. 15, 2023    
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares     $ 100,000